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                        <header>
                            <h1 class="post-title">Retroift初探</h1>
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                        <date class="post-meta meta-date">
                            2016年8月31日
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                                <a href="http://www.kikt.top/categories/android">android</a>
                            
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                            <span id="busuanzi_container_page_pv">|<span id="busuanzi_value_page_pv"></span><span> 阅读</span></span>
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                        <div class="post-content">
                            <h1 id="retrofit-初探">retrofit 初探</h1>
<h4 id="引用">引用</h4>
<h5 id="maven">maven</h5>
<div class="highlight"><pre style="color:#f8f8f2;background-color:#272822;-moz-tab-size:4;-o-tab-size:4;tab-size:4"><code class="language-xml" data-lang="xml"><span style="color:#f92672">&lt;dependency&gt;</span>
  <span style="color:#f92672">&lt;groupId&gt;</span>com.squareup.retrofit2<span style="color:#f92672">&lt;/groupId&gt;</span>
  <span style="color:#f92672">&lt;artifactId&gt;</span>retrofit<span style="color:#f92672">&lt;/artifactId&gt;</span>
  <span style="color:#f92672">&lt;version&gt;</span>2.1.0<span style="color:#f92672">&lt;/version&gt;</span>
<span style="color:#f92672">&lt;/dependency&gt;</span>
</code></pre></div><h5 id="gradle">gradle</h5>
<div class="highlight"><pre style="color:#f8f8f2;background-color:#272822;-moz-tab-size:4;-o-tab-size:4;tab-size:4"><code class="language-groovy" data-lang="groovy">    api <span style="color:#e6db74">&#39;com.squareup.retrofit2:retrofit:2.1.0&#39;</span>
</code></pre></div><h5 id="github">github</h5>
<p><a href="https://github.com/square/retrofit">github</a>
<a href="http://square.github.io/retrofit/">website</a></p>
<h3 id="个人意见">个人意见</h3>
<p>其实，最适合使用 retrofit 的是 rest 请求类的交互，如果具体的请求参数是以 url 区分业务逻辑，请求参数通过 json 进行的，那其实 retrofit 不太适用</p>
<p>俗话说，demo 是最好的学习
先来看看怎么定义业务逻辑</p>
<div class="highlight"><pre style="color:#f8f8f2;background-color:#272822;-moz-tab-size:4;-o-tab-size:4;tab-size:4"><code class="language-java" data-lang="java"><span style="color:#66d9ef">public</span> <span style="color:#66d9ef">interface</span> <span style="color:#a6e22e">GitHubService</span> <span style="color:#f92672">{</span>
  <span style="color:#a6e22e">@GET</span><span style="color:#f92672">(</span><span style="color:#e6db74">&#34;users/{user}/repos&#34;</span><span style="color:#f92672">)</span>
  Call<span style="color:#f92672">&lt;</span>List<span style="color:#f92672">&lt;</span>Repo<span style="color:#f92672">&gt;&gt;</span> <span style="color:#a6e22e">listRepos</span><span style="color:#f92672">(</span><span style="color:#a6e22e">@Path</span><span style="color:#f92672">(</span><span style="color:#e6db74">&#34;user&#34;</span><span style="color:#f92672">)</span> String user<span style="color:#f92672">);</span>
<span style="color:#f92672">}</span>
</code></pre></div><p>这里的{user}是一个会在实际使用时会被动态改变的，会根据 String user 中的变量而改变</p>
<div class="highlight"><pre style="color:#f8f8f2;background-color:#272822;-moz-tab-size:4;-o-tab-size:4;tab-size:4"><code class="language-java" data-lang="java"><span style="color:#66d9ef">public</span> <span style="color:#66d9ef">class</span> <span style="color:#a6e22e">RetrofitDemo</span> <span style="color:#f92672">{</span>
  <span style="color:#66d9ef">private</span> <span style="color:#66d9ef">static</span> OkHttpClient client<span style="color:#f92672">;</span>

    <span style="color:#66d9ef">static</span> <span style="color:#f92672">{</span>
        client <span style="color:#f92672">=</span> <span style="color:#66d9ef">new</span> OkHttpClient<span style="color:#f92672">.</span><span style="color:#a6e22e">Builder</span><span style="color:#f92672">()</span>
                <span style="color:#f92672">.</span><span style="color:#a6e22e">addInterceptor</span><span style="color:#f92672">(</span><span style="color:#66d9ef">new</span> HttpInterceptor<span style="color:#f92672">())</span>
                <span style="color:#f92672">.</span><span style="color:#a6e22e">build</span><span style="color:#f92672">();</span>
    <span style="color:#f92672">}</span>

    <span style="color:#66d9ef">public</span> <span style="color:#66d9ef">static</span> <span style="color:#66d9ef">void</span> <span style="color:#a6e22e">main</span><span style="color:#f92672">(</span>String<span style="color:#f92672">[]</span> args<span style="color:#f92672">)</span> <span style="color:#66d9ef">throws</span> IOException <span style="color:#f92672">{</span>
        Retrofit retrofit <span style="color:#f92672">=</span> <span style="color:#66d9ef">new</span> Retrofit<span style="color:#f92672">.</span><span style="color:#a6e22e">Builder</span><span style="color:#f92672">()</span>
                <span style="color:#f92672">.</span><span style="color:#a6e22e">baseUrl</span><span style="color:#f92672">(</span><span style="color:#e6db74">&#34;http://127.0.0.1:32001&#34;</span><span style="color:#f92672">)</span>
                <span style="color:#f92672">.</span><span style="color:#a6e22e">addConverterFactory</span><span style="color:#f92672">(</span>GsonConverterFactory<span style="color:#f92672">.</span><span style="color:#a6e22e">create</span><span style="color:#f92672">())</span>
  <span style="color:#75715e">//              .addConverterFactory(StringConverterFactory.create())
</span><span style="color:#75715e"></span>                <span style="color:#f92672">.</span><span style="color:#a6e22e">client</span><span style="color:#f92672">(</span>client<span style="color:#f92672">)</span>
                <span style="color:#f92672">.</span><span style="color:#a6e22e">build</span><span style="color:#f92672">();</span>

        RequestServer requestServer <span style="color:#f92672">=</span> retrofit<span style="color:#f92672">.</span><span style="color:#a6e22e">create</span><span style="color:#f92672">(</span>RequestServer<span style="color:#f92672">.</span><span style="color:#a6e22e">class</span><span style="color:#f92672">);</span>
        TestEntity bean <span style="color:#f92672">=</span> <span style="color:#66d9ef">new</span> TestEntity<span style="color:#f92672">();</span>
        bean<span style="color:#f92672">.</span><span style="color:#a6e22e">setTest</span><span style="color:#f92672">(</span><span style="color:#e6db74">&#34;text1&#34;</span><span style="color:#f92672">);</span>
        Call<span style="color:#f92672">&lt;</span>ResponseEntity<span style="color:#f92672">&gt;</span> call <span style="color:#f92672">=</span> requestServer<span style="color:#f92672">.</span><span style="color:#a6e22e">post</span><span style="color:#f92672">(</span><span style="color:#e6db74">&#34;ping&#34;</span><span style="color:#f92672">,</span> <span style="color:#e6db74">&#34;test&#34;</span><span style="color:#f92672">,</span> bean<span style="color:#f92672">);</span>
        Response<span style="color:#f92672">&lt;</span>ResponseEntity<span style="color:#f92672">&gt;</span> response <span style="color:#f92672">=</span> call<span style="color:#f92672">.</span><span style="color:#a6e22e">execute</span><span style="color:#f92672">();</span>
        ResponseEntity body <span style="color:#f92672">=</span> response<span style="color:#f92672">.</span><span style="color:#a6e22e">body</span><span style="color:#f92672">();</span>
        System<span style="color:#f92672">.</span><span style="color:#a6e22e">out</span><span style="color:#f92672">.</span><span style="color:#a6e22e">println</span><span style="color:#f92672">(</span>body<span style="color:#f92672">.</span><span style="color:#a6e22e">toString</span><span style="color:#f92672">());</span>
    <span style="color:#f92672">}</span>
<span style="color:#f92672">}</span>
</code></pre></div><p>在上述的代码中
访问的 url 是 <code>http://127.0.0.1:32001/ping/test</code>
请求的方式是<code>post</code>
返回值是<code>Call&lt;ResponseEntity&gt;</code> 这里的具体访问是框架实现的
框架会将请求的 Bean 转换成 Json Post 请求到指定的 url</p>
<p>然后返回值也会被转化成对应的类型
这里依赖的是<code>ConverterFactory</code>
这里的使用的<code>GsonConverterFactory</code> 是官方 Demo 中的一个<code>converter</code></p>
<p>用于实现 bean 到 json 的转化，再将回包转化成 bean 返回</p>
<p>看下<code>GsonConverterFactory</code>的实现</p>
<p><a href="https://github.com/square/retrofit/tree/master/retrofit-converters/gson">GsonCoveter</a>
这里其实就 4 个关键方法</p>
<div class="highlight"><pre style="color:#f8f8f2;background-color:#272822;-moz-tab-size:4;-o-tab-size:4;tab-size:4"><code class="language-java" data-lang="java">  <span style="color:#a6e22e">@Override</span>
  <span style="color:#66d9ef">public</span> Converter<span style="color:#f92672">&lt;</span>ResponseBody<span style="color:#f92672">,</span> <span style="color:#f92672">?&gt;</span> responseBodyConverter<span style="color:#f92672">(</span>Type type<span style="color:#f92672">,</span> Annotation<span style="color:#f92672">[]</span> annotations<span style="color:#f92672">,</span>
      Retrofit retrofit<span style="color:#f92672">)</span> <span style="color:#f92672">{</span>
    TypeAdapter<span style="color:#f92672">&lt;?&gt;</span> adapter <span style="color:#f92672">=</span> gson<span style="color:#f92672">.</span><span style="color:#a6e22e">getAdapter</span><span style="color:#f92672">(</span>TypeToken<span style="color:#f92672">.</span><span style="color:#a6e22e">get</span><span style="color:#f92672">(</span>type<span style="color:#f92672">));</span>
    <span style="color:#66d9ef">return</span> <span style="color:#66d9ef">new</span> GsonResponseBodyConverter<span style="color:#f92672">&lt;&gt;(</span>gson<span style="color:#f92672">,</span> adapter<span style="color:#f92672">);</span>
  <span style="color:#f92672">}</span>

  <span style="color:#a6e22e">@Override</span>
  <span style="color:#66d9ef">public</span> Converter<span style="color:#f92672">&lt;?,</span> RequestBody<span style="color:#f92672">&gt;</span> <span style="color:#a6e22e">requestBodyConverter</span><span style="color:#f92672">(</span>Type type<span style="color:#f92672">,</span>
      Annotation<span style="color:#f92672">[]</span> parameterAnnotations<span style="color:#f92672">,</span> Annotation<span style="color:#f92672">[]</span> methodAnnotations<span style="color:#f92672">,</span> Retrofit retrofit<span style="color:#f92672">)</span> <span style="color:#f92672">{</span>
    TypeAdapter<span style="color:#f92672">&lt;?&gt;</span> adapter <span style="color:#f92672">=</span> gson<span style="color:#f92672">.</span><span style="color:#a6e22e">getAdapter</span><span style="color:#f92672">(</span>TypeToken<span style="color:#f92672">.</span><span style="color:#a6e22e">get</span><span style="color:#f92672">(</span>type<span style="color:#f92672">));</span>
    <span style="color:#66d9ef">return</span> <span style="color:#66d9ef">new</span> GsonRequestBodyConverter<span style="color:#f92672">&lt;&gt;(</span>gson<span style="color:#f92672">,</span> adapter<span style="color:#f92672">);</span>
  <span style="color:#f92672">}</span>
</code></pre></div><div class="highlight"><pre style="color:#f8f8f2;background-color:#272822;-moz-tab-size:4;-o-tab-size:4;tab-size:4"><code class="language-java" data-lang="java"><span style="color:#a6e22e">@Override</span> <span style="color:#66d9ef">public</span> RequestBody <span style="color:#a6e22e">convert</span><span style="color:#f92672">(</span>T value<span style="color:#f92672">)</span> <span style="color:#66d9ef">throws</span> IOException <span style="color:#f92672">{</span>
    Buffer buffer <span style="color:#f92672">=</span> <span style="color:#66d9ef">new</span> Buffer<span style="color:#f92672">();</span>
    Writer writer <span style="color:#f92672">=</span> <span style="color:#66d9ef">new</span> OutputStreamWriter<span style="color:#f92672">(</span>buffer<span style="color:#f92672">.</span><span style="color:#a6e22e">outputStream</span><span style="color:#f92672">(),</span> UTF_8<span style="color:#f92672">);</span>
    JsonWriter jsonWriter <span style="color:#f92672">=</span> gson<span style="color:#f92672">.</span><span style="color:#a6e22e">newJsonWriter</span><span style="color:#f92672">(</span>writer<span style="color:#f92672">);</span>
    adapter<span style="color:#f92672">.</span><span style="color:#a6e22e">write</span><span style="color:#f92672">(</span>jsonWriter<span style="color:#f92672">,</span> value<span style="color:#f92672">);</span>
    jsonWriter<span style="color:#f92672">.</span><span style="color:#a6e22e">close</span><span style="color:#f92672">();</span>
    <span style="color:#66d9ef">return</span> RequestBody<span style="color:#f92672">.</span><span style="color:#a6e22e">create</span><span style="color:#f92672">(</span>MEDIA_TYPE<span style="color:#f92672">,</span> buffer<span style="color:#f92672">.</span><span style="color:#a6e22e">readByteString</span><span style="color:#f92672">());</span>
  <span style="color:#f92672">}</span>
</code></pre></div><div class="highlight"><pre style="color:#f8f8f2;background-color:#272822;-moz-tab-size:4;-o-tab-size:4;tab-size:4"><code class="language-java" data-lang="java">  <span style="color:#a6e22e">@Override</span> <span style="color:#66d9ef">public</span> T <span style="color:#a6e22e">convert</span><span style="color:#f92672">(</span>ResponseBody value<span style="color:#f92672">)</span> <span style="color:#66d9ef">throws</span> IOException <span style="color:#f92672">{</span>
  JsonReader jsonReader <span style="color:#f92672">=</span> gson<span style="color:#f92672">.</span><span style="color:#a6e22e">newJsonReader</span><span style="color:#f92672">(</span>value<span style="color:#f92672">.</span><span style="color:#a6e22e">charStream</span><span style="color:#f92672">());</span>
    <span style="color:#66d9ef">try</span> <span style="color:#f92672">{</span>
      <span style="color:#66d9ef">return</span> adapter<span style="color:#f92672">.</span><span style="color:#a6e22e">read</span><span style="color:#f92672">(</span>jsonReader<span style="color:#f92672">);</span>
    <span style="color:#f92672">}</span> <span style="color:#66d9ef">finally</span> <span style="color:#f92672">{</span>
      value<span style="color:#f92672">.</span><span style="color:#a6e22e">close</span><span style="color:#f92672">();</span>
    <span style="color:#f92672">}</span>
  <span style="color:#f92672">}</span>
</code></pre></div><p>前两个方法用于生成 Converter</p>
<p>后面的是 Converter 中的方法
用于将 bean 转化成 RequestBody
和将 ResponseBody 转化成 bean</p>
<p>仿照这个自己写一个 Factory
StringConverterFactory</p>
<div class="highlight"><pre style="color:#f8f8f2;background-color:#272822;-moz-tab-size:4;-o-tab-size:4;tab-size:4"><code class="language-java" data-lang="java"><span style="color:#66d9ef">public</span> <span style="color:#66d9ef">final</span> <span style="color:#66d9ef">class</span> <span style="color:#a6e22e">StringConverterFactory</span> <span style="color:#66d9ef">extends</span> Converter<span style="color:#f92672">.</span><span style="color:#a6e22e">Factory</span> <span style="color:#f92672">{</span>

  <span style="color:#66d9ef">public</span> <span style="color:#66d9ef">static</span> StringConverterFactory <span style="color:#a6e22e">create</span><span style="color:#f92672">()</span> <span style="color:#f92672">{</span>
    <span style="color:#66d9ef">return</span> <span style="color:#66d9ef">new</span> StringConverterFactory<span style="color:#f92672">();</span>
  <span style="color:#f92672">}</span>

  <span style="color:#66d9ef">private</span> <span style="color:#a6e22e">StringConverterFactory</span><span style="color:#f92672">()</span> <span style="color:#f92672">{</span>
  <span style="color:#f92672">}</span>

  <span style="color:#a6e22e">@Override</span>
  <span style="color:#66d9ef">public</span> Converter<span style="color:#f92672">&lt;</span>ResponseBody<span style="color:#f92672">,</span> <span style="color:#f92672">?&gt;</span> responseBodyConverter<span style="color:#f92672">(</span>Type type<span style="color:#f92672">,</span> Annotation<span style="color:#f92672">[]</span> annotations<span style="color:#f92672">,</span> Retrofit retrofit<span style="color:#f92672">)</span> <span style="color:#f92672">{</span>
    <span style="color:#66d9ef">return</span> <span style="color:#66d9ef">new</span> StringResponseBodyConverter<span style="color:#f92672">();</span>
  <span style="color:#f92672">}</span>

  <span style="color:#a6e22e">@Override</span>
  <span style="color:#66d9ef">public</span> Converter<span style="color:#f92672">&lt;?,</span> RequestBody<span style="color:#f92672">&gt;</span> <span style="color:#a6e22e">requestBodyConverter</span><span style="color:#f92672">(</span>Type type<span style="color:#f92672">,</span> Annotation<span style="color:#f92672">[]</span> parameterAnnotations<span style="color:#f92672">,</span> Annotation<span style="color:#f92672">[]</span> methodAnnotations<span style="color:#f92672">,</span> Retrofit retrofit<span style="color:#f92672">)</span> <span style="color:#f92672">{</span>
    <span style="color:#66d9ef">return</span> <span style="color:#66d9ef">new</span> StringRequestBodyConverter<span style="color:#f92672">();</span>
  <span style="color:#f92672">}</span>
<span style="color:#f92672">}</span>

</code></pre></div><p>StringRequestBodyConverter</p>
<div class="highlight"><pre style="color:#f8f8f2;background-color:#272822;-moz-tab-size:4;-o-tab-size:4;tab-size:4"><code class="language-java" data-lang="java"><span style="color:#66d9ef">final</span> <span style="color:#66d9ef">class</span> <span style="color:#a6e22e">StringRequestBodyConverter</span> <span style="color:#66d9ef">implements</span> Converter<span style="color:#f92672">&lt;</span>String<span style="color:#f92672">,</span> RequestBody<span style="color:#f92672">&gt;</span> <span style="color:#f92672">{</span>

    StringRequestBodyConverter<span style="color:#f92672">()</span> <span style="color:#f92672">{</span>
    <span style="color:#f92672">}</span>

    <span style="color:#a6e22e">@Override</span>
    <span style="color:#66d9ef">public</span> RequestBody <span style="color:#a6e22e">convert</span><span style="color:#f92672">(</span>String s<span style="color:#f92672">)</span> <span style="color:#66d9ef">throws</span> IOException <span style="color:#f92672">{</span>
        <span style="color:#66d9ef">return</span> RequestBody<span style="color:#f92672">.</span><span style="color:#a6e22e">create</span><span style="color:#f92672">(</span>MediaType<span style="color:#f92672">.</span><span style="color:#a6e22e">parse</span><span style="color:#f92672">(</span><span style="color:#e6db74">&#34;text/json&#34;</span><span style="color:#f92672">),</span> s<span style="color:#f92672">);</span>
    <span style="color:#f92672">}</span>
<span style="color:#f92672">}</span>

</code></pre></div><p>StringResponseBodyConverter</p>
<div class="highlight"><pre style="color:#f8f8f2;background-color:#272822;-moz-tab-size:4;-o-tab-size:4;tab-size:4"><code class="language-java" data-lang="java"><span style="color:#66d9ef">final</span> <span style="color:#66d9ef">class</span> <span style="color:#a6e22e">StringResponseBodyConverter</span> <span style="color:#66d9ef">implements</span> Converter<span style="color:#f92672">&lt;</span>ResponseBody<span style="color:#f92672">,</span> String<span style="color:#f92672">&gt;</span> <span style="color:#f92672">{</span>

    StringResponseBodyConverter<span style="color:#f92672">()</span> <span style="color:#f92672">{</span>
    <span style="color:#f92672">}</span>

    <span style="color:#a6e22e">@Override</span>
    <span style="color:#66d9ef">public</span> String <span style="color:#a6e22e">convert</span><span style="color:#f92672">(</span>ResponseBody value<span style="color:#f92672">)</span> <span style="color:#66d9ef">throws</span> IOException <span style="color:#f92672">{</span>

        <span style="color:#66d9ef">try</span> <span style="color:#f92672">{</span>
            <span style="color:#66d9ef">return</span> value<span style="color:#f92672">.</span><span style="color:#a6e22e">string</span><span style="color:#f92672">();</span>
        <span style="color:#f92672">}</span> <span style="color:#66d9ef">finally</span> <span style="color:#f92672">{</span>
            value<span style="color:#f92672">.</span><span style="color:#a6e22e">close</span><span style="color:#f92672">();</span>
        <span style="color:#f92672">}</span>
    <span style="color:#f92672">}</span>
<span style="color:#f92672">}</span>

</code></pre></div><p>其实就是 Factory 中的两个方法控制使用哪个转化器转化
两个 Convert 控制怎么转化</p>

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